“It can ‘incept’ a person to acquire new learning, skills, or memory, or possibly to restore skills or knowledge that has been damaged through accident, disease, or aging, without a person’s awareness of what is learned or memorized,”

They have to get pretty close to be able to pich out discrete brainwaves from different brain regions. Even a small electronic device would be sufficient, if they could induce the subject to carry it unwittingly.